Re: Denial of Service, Good for AS/400?

John,

    Great comment.  I thought you could not alter the state of a program, from
user to system (or back) if you were running at security level 40.  Was this 
user
running at level 30?

    Pete

John Earl wrote:

> Jim,
>
> joberhol@compures.com wrote:
> >
> >
> > How can an OS/400  virus spread when the processor instructions to
> > create/change an object are privileged?    That means only IBM processes
> > can create a virus. Once the object is created, it cannot be altered except
> > with privileged instructions that a non-IBM process cannot use.   Almost
> > any machine at level 40 security is completely protected.
> >
>
> There was an interesting post on comp.sys.ibm.as400.misc within the
> last month or so about a "clever" AS/400 software vendor who was using
> SST to automatically turn turn their programs into system state
> programs during their software installation process.  Apparantly they
> were using the virtual terminal API's to simulate an interactive
> session and run the STRSST command.  From there into
> "Display/Alter/Dump" and you can toggle your program to system state.
> The only way that the poster figured out what had happened was by
> wading through a strange 449 page 5250 hex dump that was left over by
> the install process.
>
> For more information, do a power search on deja.com against the
> comp.sys.ibm.as400.misc and keywords "Tom Liotta" and "STRSST".
>
> And never say never.
>
> jte
>
>
>
> --
> John Earl
> johnearl@powertechgroup.com
> The PowerTech Group                        206-575-0711
> PowerLock Network Security              www.400security.com
> The 400 School                                www.400school.com
> --
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--
Pete Massiello
OS Solutions International
Phone: (203)-744-7854  Ext 11.
http://www.os-solutions.com
mailto:pmassiello@os-solutions.com


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